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408 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21
Size and sex: Males are from 15.5 to 66 mm, females from 11.5 to
73 mm, and young from 5.6 mm. Crane (1937) records ovigerous females from 69.5 to 81.5 mm.
Breeding: Gulf of California in April. (Crane)
Measurements: For convenience in comparison, measurements of the
largest male and female examined are given in tabular form: (in millimeters)
Male
Female
Length, including rostrum
66
73
Width, including spines
60
67
Width, without spines
54
58
Length of rostrum
8.0
9.0
Width of rostrum
8.2
8.5
Cheliped
70
70
Chela
30
31.5
Dactyl
13.1
13
Height of palm
5.8
5.6
First ambulatory leg
82
82
Second ambulatory leg
70
Third ambulatory leg
62
Fourth ambulatory leg
52
Remarks: Evidence has been accumulating to support the suggestion
of Rathbun (1925, p. 461 ff.) that specimens formerly identified as
Stenocionops triangulata are actually the young of S. macdonaldi. In
recording 12 females measuring 61.5 to 81.5 mm and a single male
measuring 37.5 mm, Crane (1937, p. 62) suggested that a still smaller
specimen be secured before the two species were synonymized. Velero HI
specimens bridge at regular intervals the gap between the 30 mm S.
triangulata and the 93 mm S. macdonaldi for which measurements were
given by Rathbun (op. cit.). A 73 mm female from Bahia Honda,
Panama, has the two principal hepatic spines but lacks the supplementary
hepatic spinule of the 88 mm holotype of S. macdonaldi. Its rostrum
is equal to one-eighth the carapace length, instead of one-twelfth. A 66
mm male from Panama has also two hepatic spines and a rostrum equal
to one-eighth of the carapace length. In a 43 mm female from Panama
the anterior hepatic spine is but half the size of the posterior or principal
hepatic spine, and the rostrum is between one-sixth and one-seventh the
length of the carapace.

408 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21
Size and sex: Males are from 15.5 to 66 mm, females from 11.5 to
73 mm, and young from 5.6 mm. Crane (1937) records ovigerous females from 69.5 to 81.5 mm.
Breeding: Gulf of California in April. (Crane)
Measurements: For convenience in comparison, measurements of the
largest male and female examined are given in tabular form: (in millimeters)
Male
Female
Length, including rostrum
66
73
Width, including spines
60
67
Width, without spines
54
58
Length of rostrum
8.0
9.0
Width of rostrum
8.2
8.5
Cheliped
70
70
Chela
30
31.5
Dactyl
13.1
13
Height of palm
5.8
5.6
First ambulatory leg
82
82
Second ambulatory leg
70
Third ambulatory leg
62
Fourth ambulatory leg
52
Remarks: Evidence has been accumulating to support the suggestion
of Rathbun (1925, p. 461 ff.) that specimens formerly identified as
Stenocionops triangulata are actually the young of S. macdonaldi. In
recording 12 females measuring 61.5 to 81.5 mm and a single male
measuring 37.5 mm, Crane (1937, p. 62) suggested that a still smaller
specimen be secured before the two species were synonymized. Velero HI
specimens bridge at regular intervals the gap between the 30 mm S.
triangulata and the 93 mm S. macdonaldi for which measurements were
given by Rathbun (op. cit.). A 73 mm female from Bahia Honda,
Panama, has the two principal hepatic spines but lacks the supplementary
hepatic spinule of the 88 mm holotype of S. macdonaldi. Its rostrum
is equal to one-eighth the carapace length, instead of one-twelfth. A 66
mm male from Panama has also two hepatic spines and a rostrum equal
to one-eighth of the carapace length. In a 43 mm female from Panama
the anterior hepatic spine is but half the size of the posterior or principal
hepatic spine, and the rostrum is between one-sixth and one-seventh the
length of the carapace.